Feature in the Crab pulsar gamma‐ray spectrum

During the third flight of the FIGARO II experiment on July 9th 1990 the Crab pulsar PSR0531+21 has been kept in the axis of the telescope during 7.5 hours.On line analysis showed the pulsar light curve with only 5 minutes of data acquisition time.The complete analysis of the observation will probably help to search for gamma ray line in the pulsed part of the spectrum.Particularly a line around 450 keV has been previously detected by some experiments but at low statistical level and attributed ambiguously to the Nebula.